Series LTS | Tilt Switch Probe senses either the presence or absence of material. Airtight, dust tight, and waterproof. Applications include large hoppers, silos, crushers, trippers, stackers, and conveyors. | Dwyer Instruments
Micro SMD tilt switch? - General Electronics - Arduino Forum
What are Tilt Switches and Tilt Sensors? | Level Developments
In-Depth: Interfacing Ball Tilt Switch Sensor with Arduino